<template>
  <div>
    <div style="display:inline-block" v-for="(item,i) in arr" :key="i">
      <input type="checkbox" v-model="val" :value="item">
    <span>{{item}}</span>
    </div>
    <p>你选中的元素，累加的值和为：{{sum}}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
    arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
    val:[]
    }
  },
  computed: {
    sum() {
      return this.val.reduce((a, b) => a + b, 0)
    },
  },
}
</script>
<style scoped>
</style>